Drilling-machine.



No. 632,594. Patented Sept. 5, [899. H. STAPELMANN.

DRILLING MACHINE.

(Application filed m 26, 1897.)

(No lludal.)

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UNITED STATES PATENT OFFICE.

HERMANN STAPELMANN, OF SHAWNEE, OHIO.

DRILLING -MACHINE.

SPECIFICATION forming part of Letters Patent No. 632,594, datedSeptember 5, 1899.

Application filed May 26, 1897. Serial No. 638,265. (No model.)

To all whom it may concern:

Be it known that I, HERMANN STAPELMANN, of Shawnee, in the county ofPerry and State of Ohio, have invented certain new and usefulImprovements in Drillin -Machines; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to improvements in drilling-machines, and moreparticularly to the manner-of feeding the threaded shaft, the object ofthe same being to provide a cheaper construction and arrangement thatwill permit the threaded portion of the boxing to be renewed withouthaving to renew the whole boxing, and also provides for reversing theparts in starting the drill again.

With the above objects in view the invention consists in providing atwo-part boxing presentingacentral cavity and opposite openings and aremovable nut seated within the cavity to engage the shaft which ispassed therethrough, the opposite ends of the shaft being flattened toreceive the bit and having a longitudinal channel or recess by which thegear-wheel of the driving mechanism is connected therewith.

In the following specification I have entered into a detail descriptionof the invention, reference being had'to the accompanying drawings, andto numerals thereon which designate the different parts, and what Iconsider to be the novel features of construction are specifically setforth in the claim.

In the drawings forming part of this specification, Figure 1 is aperspective view of so much of a drilling-machine as will illustrate myinvention. Fig. 2 is a detail View of the two-part boxing. Fig. 3 is adetail view of the removable nut. Fig. 4 is a detail view showing thedivided removable nut.

Referring to the drawings by numerals, 1 and 2 designate the two partsof the boxing, which are hinged to each other at one end by a pintle 3,passing through apertured lugs formed thereon. These parts are enlargedtheir inner sides the parts 1 and 2 are provided with semicircularrecesses 6, which form openings on a line with the threaded opening ofthe not when the latter is seated within the boxing, the said partsbeing held in a locked position by means of a weighted arm 7, which ispivoted upon abearing-pin 8 between apertured lugs 9 on the outer end ofone part or section of the boxing and engages a recess 10 extendingacross the end of the other part or section, the arm having a ball 11,which engages the opposite section. The boxing is provided withtrunnions 12 12, by which it is mounted within the supportingframe ofthe machine, and one of said parts or sections has a projecting arm 13,carrying a socket or bearing 14, in which is mounted a short shaft 15,carrying a pinion 16, the outer end of the said shaft being squared,asshown, to receive the crank-handle 17.

18 designates the threaded shaft, which carries the bit, and inconnection with the particular construction hereinbefore described thesaid shaft is provided at each end with a reduced portion 19, which istriangular in cross-section 0r squared and has an aperture or opening 20therethrough. The shaft is provided with the usual threads and has alongitudinal recess or groove 24: therein, with which engages a lugprojecting into the axial opening of a large gear-wheel 22, which isloosely mounted on the shaft and meshes with the pinion 16, hereinbeforereferred to.

One part orsection of the boxingis provided with an oil-hole 23, whichcommunicates with a hole 26 extending through the nut, in order toprovide for lubricating the parts at this point, the socket or bearing14 also having an oil-hole.

The operation of the devices hereinbefore described will be readilyunderstood, for when the parts are assembled the turning of thecrank-handle will turn the threaded shaft through the intervention ofgear-wheels 16 and 22, and as said shaft engages the threads of the nutlocated within the boxing it will feed forward at the same time, andwhen the shaft passes nearly through the boxing the parts of the lattermay be separated'and the shaft removed and then reversed withoutrequiring the shaft to be run back. In reversing this shaft the bit isremoved from one end and placed upon the other, a cotter-pin or otherequivalent device being employed to rigidly connect the said bit to theshaft and also provide for readily making the change. This particularconstruction and arrangement forms a means that will save the time andtrouble of running the shaft back after using the drill. By forming thethreaded portion of the socket independent of the boxing it provides forreplacing the said threaded portion without having to replace the wholeboxing, and it also permits of the boxing being made of cast metal, asit is not required to form any threads therein. boxing through which theshaft passes are of such size as not to interfere with the free passageof the shaft, and by locking the parts in the particular manner shownand described it provides for a rapid and convenient manipulation inreversing the threaded shaft.

It is apparent that the nut could be made in two parts and separated torun the threaded shaft back in starting the drill, as shown in Fig. 4.

Having thus described my invention, what The openings through the- Iclaim as new, and desire to secure by Letters Patent, is

In a drilling-machine, the combination with a two-part boxing hinged toeach other at one end and having communicating recesses at its otherend, a gravity-arm pivoted to the upper devices for holding the bit inplace, and mech-.

anism for turning the shaft, substantially as shown and for the purposeset forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

HERMANN STAPELMANN.

Witnesses:

CHAS. '1. GRIFFITH, CHARLES RUsK.

